<html>
    <head>
    </head>
    <body>
        <h1>
            This is the page 3!<br>The post was correctly done :-)<br>
            <form action="/page_3" method="post">
                <input type="text" name="username">
                <input type="submit" value="Submit">
            </form>
        </h1>
    </body>
</html>